Just don't make houses out of flammable materials. Easy. Exterior walls must be cinder block filled with concrete and rebar or poured concrete with lots of rebar and perhaps fiber reinforcement. Roofs must be metal or ceramic or stone.
I don't think anyone really understands how intense wildfires can get when fanned by wind. It will destroy almost anything.
See: Black Saturday bushfires, Australia.
> "it really made no difference whether the houses were brick or timber. In fact, with the speed of the fire front some timber houses fared better than brick as it moved too fast for the houses to catch, but the bricks exploded from the sudden change in temperature."
> "When you have a fire front coming through at 800C it'll melt your window seals and aluminum window frames. The glass will fall out then everything is on fire.